M
M4
Manual 2.2 en
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General information
M4 Manual
Version: 2.2 en, 11/2018, D2990.EN .02
Copyright © 2018 by d&b audiotechnik GmbH & Co. KG; all
rights reserved.
Keep this document with the product or in a safe place
so that it is available for future reference.
We recommend you to regularly check the d&b website for the
latest version of this document.
When reselling this product, hand over this document to the new
owner.
If you supply d&b products, please draw the attention of your
customers to this document. Enclose the relevant documents with
the systems. If you require additional documents for this purpose,
you can order them from d&b.
d&b audiotechnik GmbH & Co. KG
Eugen-Adolff-Str. 134, D-71522 Backnang, Germany
T +49-7191-9669-0, F +49-7191-95 00 00
1 Safety precautions.............................................................. 4
1.1 Information regarding the use of loudspeakers........................ 4
2 M4 loudspeaker................................................................... 5
2.1 Product description..................................................................... 5
2.2 Connections................................................................................ 5
2.3 Operation.................................................................................... 7
2.3.1 Controller settings.................................................................... 8
2.3.2 Operation with E-PAC............................................................. 8
2.4 Dispersion characteristics........................................................... 9
2.5 Technical specifications............................................................ 10
3 Manufacturer's declarations......................................... 11
3.1 EU conformity of loudspeakers (CE symbol).......................... 11
3.2 WEEE Declaration (Disposal).................................................. 11
Contents
d&b M4 Manual 2.2 en 3
1.1 Information regarding the use of loudspeakers
Potential risk of personal injury
Never stand in the immediate vicinity of loudspeakers driven at a
high level. Professional loudspeaker systems are capable of
causing a sound pressure level detrimental to human health.
Seemingly non-critical sound levels (from approx. 95 dB SPL) can
cause hearing damage if people are exposed to it over a long
period.
In order to prevent accidents when deploying loudspeakers on the
ground or when flown, please take note of the following:
▪ When setting up the loudspeakers or loudspeaker stands, make
sure they are standing on a firm surface. If you place several
systems on top of one another, use straps to secure them
against movement.
▪ Only use accessories which have been tested and approved by
d&b for assembly and mobile deployment. Pay attention to the
correct application and maximum load capacity of the
accessories as detailed in our specific "Mounting instructions" or
in our "Flying system and Rigging manuals".
▪ Ensure that all additional hardware, fixings and fasteners used
for installation or mobile deployment are of an appropriate size
and load safety factor. Pay attention to the manufacturers'
instructions and to the relevant safety guidelines.
▪ Regularly check the loudspeaker housings and accessories for
visible signs of wear and tear, and replace them when
necessary.
▪ Regularly check all load bearing bolts in the mounting devices.
Potential risk of material damage
Loudspeakers produce a static magnetic field even if they are not
connected or are not in use. Therefore make sure when erecting
and transporting loudspeakers that they are nowhere near
equipment and objects which may be impaired or damaged by an
external magnetic field. Generally speaking, a distance of 0.5 m
(1.5 ft) from magnetic data carriers (floppy disks, audio and video
tapes, bank cards, etc.) is sufficient; a distance of more than 1 m
(3 ft) may be necessary with computer and video monitors.
1 Safety precautions
d&b M4 Manual 2.2 en4
2.1 Product description
The M4 is a high performance stage monitor employing an
integrated15"/1.3" exit coaxial driver design with neodymium
magnet and constant directivity horn loading. Its dispersion of 50°
x 70° (hor. x vert.) provides an accurately defined coverage area
on stage. Used upright the M4 serves as a powerful front PA
speaker (70° x 50°) for various applications.
The M4 is a two-way design with a built-in passive crossover
network. It can optionally be operated in two-way active mode just
by changing the configuration of the applicable amplifier without
any modifications to the loudspeaker. Its frequency response
extends from 55 Hz to above 17 kHz.
The cabinet is constructed from marine plywood and has an impact
resistant paint finish. The front of the loudspeaker cabinet is
protected by a rigid metal grill in front of an acoustically
transparent foam. Each side panel incorporates a handle while
four M10 threaded inserts allow connection to different rigging
devices and brackets. A pole mount is incorporated in one side
panel to accept a loudspeaker stand. Two runners recessed in the
bottom panel prevent cabinet movement and protect the bottom
panel against scratching.
2.2 Connections
The cabinet is fitted with NLT4 F/M connectors. All four pins of
both connectors are wired in parallel using the pin assignments
1+/1– (LF) and 2+/2– (HF). Using one connector as the input, the
second connector allows for direct connection to a second cabinet.
The cabinet can be supplied with NL4 M or EP5 connectors as an
option.
LF + LF – HF + HF – n.c.
NLT4 F/M
NL4 M
1+ 1– 2+ 2– -
EP5 1 2 3 4 5
M4 loudspeaker
NLT4 F/M connector wiring
2 M4 loudspeaker
d&b M4 Manual 2.2 en 5
WR option (Weather Resistance)
A number of d&b loudspeakers are available in special options
suitable for different types of installed applications and
environmental conditions. The following options are available:
▪ Sea water resistant (SWR): This option is suitable for outdoor
use, especially in wet and acid or salty environments.
WR cabinets are equipped with a recessed connector panel
including a Faston type connector (2 x 6.3 mm, female). A cover
plate which accepts single or dual PG cable glands (Type PG13.5
for cable diameters from 6 - 12 mm) is enclosed, as shown in the
graphic opposite.
NOTICE!
The WR option enables operation of loudspeakers in changing
ambient conditions, however it is not intended to enable
permanent, unprotected operation of loudspeakers outdoors.
▪ Provide an additional cover over the loudspeakers.
▪ Aim the cabinets either horizontally or with a downward tilt.
To install the fixed connection cable, please proceed as follows:
Tools required: Screw driver (#T20).
Note: Observe the correct polarity of the cable
Brown (+) / Blue (—).
1. Insert the connection cable through the PG screwing and
connect the male connector to the female connector.
2. Push the cover plate towards the connector panel until it fits
into place.
3. Fix the cover plate to the connector panel using the four
countersunk screws.
Faston type connector, male single PG (standard), dual PG
(optional)
d&b M4 Manual 2.2 en6
2.3 Operation
NOTICE!
Only operate d&b loudspeakers with a correctly configured d&b
amplifier, otherwise there is a risk of damaging the loudspeaker
components.
Applicable d&b amplifiers:
D80/D20/D12/D6/10D/30D.
Application Setup Cabinets per
channel
M4 passive M4
(Dual Channel or
Mix TOP/SUB
mode)
2
Application Setup Cabinets per
pair of amplifier
channels
M4 active M4
(2-Way Active
mode)
2
Passive operation ("Dual channel" mode)
Selecting "Dual channel" mode with the M4 setup enables up to
two M4 cabinets to be driven by the respective channel.
In "Dual channel" mode each amplifier channel drives all output
pins of its respective output connector thus driving the cabinet's HF
and LF sections via their passive crossover networks. Pins 1+/2+ of
the NL4 output connector (EP5: 1/3) carry the positive and pins
1–/2– (EP5: 2/4 ) carry the negative components of the signal.
Passive operation ("Mix TOP/SUB" mode)
With its standard connector wiring the M4 requires 4 wires to be
driven and therefore cannot be used in "Mix TOP/SUB" mode.
However, for permanent passive use with dedicated 2-wire cabling
the M4 setup is also available in "Mix TOP/SUB" mode.
Input/Output routing "Dual channel"*
* Schematic diagram
Input/Output routing "Mix TOP/SUB"*
* Schematic diagram
d&b M4 Manual 2.2 en 7
Active operation ("2–Way Active" mode)
Selecting "2–Way Active" mode with the M4 setup enables up to
two M4 cabinets to be driven actively by the respective amplifier.
In "2–Way Active" mode separate LF and HF signals are routed to
the amplifier channels. Pins 1+/1– of both NL4 output connectors
(EP5: pins 1/2) carry the LF signal, pins 2+/2– (EP5: 3/4) carry
the HF signal.
For D80 and D12 amplifiers, the output connector pin assignment
is set automatically when "2–Way Active" mode is selected. For all
other applicable amplifiers, a dedicated socket for active
operation is available.
The input signal can be fed either to INPUT A or to INPUT B and is
routed (linked) to both amplifier channels internally.
2.3.1 Controller settings
For acoustic adjustment the functions CUT, HFA and CPL can be
selected.
CUT mode
Set to CUT, the low frequency level is reduced. The cabinet is now
configured for use with actively driven d&b subwoofers.
HFA mode
In HFA mode (High Frequency Attenuation), the HF response of the
system is rolled off. HFA provides a natural, balanced frequency
response when a cabinet is placed close to listeners in near field or
delay use.
High Frequency Attenuation begins gradually at 1 kHz, dropping
by approximately 3 dB at 10 kHz. This roll off mimics the decline
in frequency response experienced when listening to a system from
a distance in a typically reverberant room or auditorium.
CPL function
The CPL (Coupling) function compensates for coupling effects
between the cabinet and close boundary surfaces or when the
cabinet is used as a stage monitor. CPL begins gradually around
1 kHz, with the maximum attenuation below 400 Hz. To achieve a
balanced frequency response, the CPL function can be set to dB
attenuation values between 0 and ––9.
Positive CPL values create an adjustable low frequency boost (0 to
++5 dB) and can be set when the system is used in full range
mode without subwoofers.
For a single cabinet in free space conditions a value of +3 dB is
recommended.
2.3.2 Operation with E-PAC
Selecting M4 mode enables the E-PAC to drive one M4
loudspeaker. LO IMP mode configures the E-PAC to drive a
maximum of two M4 loudspeakers with a 6 dB reduction in input
level to the loudspeakers.
For acoustic adjustment the CUT and HFA modes are available.
The characteristics are described in the previous section.
Input/Output routing "2–Way Active"*
* Schematic diagram
-5
0
5
10
-10
-15
-20
-25
-30
20
100 1k 10k
20k
Frequency response correction in HFA mode
Frequency response correction of the CPL function
d&b M4 Manual 2.2 en8
2.4 Dispersion characteristics
The graphs below show dispersion angle over frequency of a
single M4 cabinet plotted using lines of equal sound pressure
(isobars) at –6 dB and –12 dB. The characteristics refer to monitor
operation. When used as a front-of-house system, the horizontal
dispersion corresponds to the vertical plot and vice versa.
Isobar diagram M4 vertical, monitor setup
(horizontal, front-of-house setup)
Altering the HF horn dispersion
The HF horn can be rotated through 90° for dedicated installation
applications.
Tools required: Torx wrench (#TX25).
Proceed as follows:
1. Disconnect the loudspeaker.
2. Undo the 10 screws holding the front grill and remove the
front grill.
3. Undo the screws holding the horn flange and the two opposite
screws at the 15" driver for the desired orientation.
4. Rotate the horn to the desired orientation.
5. Refit all screws and tighten them using a torque setting of
2 N×m.
6. Refit the front grill and tighten all screws using a torque setting
of 4 N×m.
Isobar diagram M4 horizontal, monitor setup
(vertical, front-of-house setup)
Altering the HF horn dispersion
d&b M4 Manual 2.2 en 9
2.5 Technical specifications
M4 system data
Frequency response (–5 dB standard) 55 Hz - 17 kHz
Frequency response (–5 dB CUT mode) 95 Hz - 17 kHz
Max. sound pressure (single cabinet, 1 m, free field)
with D6/10D/E-PAC passive mode 134 dB
with 10D active mode 135 dB
with D80/D20/D12/30D passive mode 138 dB
with D80/D20/D12/30D active mode 140 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
M4 loudspeaker
Nominal impedance
8 ohms
Power handling capacity (RMS / peak 10 ms) 400/1600 W
Nominal dispersion angle (hor. x vert., monitor setup) 50° x 70°
Components 15" LF driver with neodymium magnet
coaxial 1.3" exit compression driver with 3" coil and CD horn
Passive crossover network
Connections NLT4 F/M
(optional 2 x EP5)
WR option: Faston type connector (2 x 6.3 mm), female
Pin assignment NLT4 F/M: 1+: LF+/1–: LF– | 2+: HF+/2–: HF–
EP5: 1: LF+ | 2: LF– | 3: HF+ | 4: HF– | 5: n.c.
WR option: Brown: (+) / Blue: (–)
Weight 20 kg (44 lb)
M4 frequency response, standard and CUT modes
M4 cabinet dimensions in mm [inch]
d&b M4 Manual 2.2 en10
3.1 EU conformity of loudspeakers (CE symbol)
This declaration applies to:
d&b Z0800 M4 loudspeaker
manufactured by d&b audiotechnik GmbH & Co. KG.
All product variants are included, provided they correspond to the
original technical version and have not been subject to any later
design or electromechanical modifications.
We herewith declare that said products are in conformity with the
provisions of the respective EC directives including all applicable
amendments.
A detailed declaration is available on request and can be ordered
from d&b or downloaded from the d&b website at
www.dbaudio.com.
3.2 WEEE Declaration (Disposal)
Electrical and electronic equipment must be disposed of separately
from normal waste at the end of its operational lifetime.
Please dispose of this product according to the respective national
regulations or contractual agreements. If there are any further
questions concerning the disposal of this product, please contact
d&b audiotechnik.
WEEE-Reg.-Nr. DE: 13421928
3 Manufacturer's declarations
d&b M4 Manual 2.2 en 11
D2990.EN .02, 11/2018 © d&b audiotechnik GmbH & Co. KG
www.dbaudio.com
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